[5] Cornufer heffernani has a small, delicate, slender body and limbs.

[5] A syntype specimen of Hylella solomonis in the Senckenberg Museum measures 28 mm (1.1 in) in snout–vent length.

Skin is smooth above but granular on the flanks, the belly, and under surface of the upper arm and thighs.

Preserved specimens are purplish brown above and yellow below, fading to yellowish all over with time.

[3][4] Cornufer heffernani is a very rare species that is found on low vegetation and trees in tropical rain forests.